Drill holder



Feb. 2 1926.

- F. M. BETTES DRI LL HOLDER /.Filed May 22, 1922 IIIIIWII Patented Feb. 2, 1926.

UNITE FRED M. BETTES, OF EBIE, PENNSYLVANIA, ASSIGNOR TO ERIE CITY IRON WORKS, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

DRILL HOLDER.

Application filed May 22, 1922.

T 0 all whom it may concern:

Be it known that I, F Rno M. Bn'rrns, a citizen of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful IIIIPIOVQHIGDCS in Drill Holders, of which the following is a specification.

This invention is designed to improve that type of drill holder, commonly called an old man. This tool ordinarily consists of a bar that can be inserted into and wedged in a boiler flue. It has an upturned arm forming a support backing the drill. Vith the old man in common use flues are very often injured by the wedging of the bar in the flue. With my invention I provide the bar with means which will so engage the tube as to hold the bar in place and at the same time will not injure the tube, thus increasing the convenience of use of the bar and decreasing the chance for injury to the tube. I

The invention is illustrated in the accom panying drawings as follows:

Fig. 1 shows a side elevation of the bar.

Fig. 2 an end elevation of the bar.

Fig. 3 an elevation of the bar in place, the boiler being shown partly in section.

1 marks the boiler, and 2 the flues in the boiler. A horizontal bar 3 of the old man is adapted to be inserted in a flue. This is preferably made with this construction as small as consistent with the pressure which is put upon it. An arm 4 extends at an angle to the bar and a drill 5 is backed by the arm 4 and operates against the head of the boiler for drilling brace holes in the head of the boiler.

Serial No. 562,579.

A collar 6 is detachably mounted on the end of the bar ordinarily held in place by a pin shown in dotted lines in Fig. 1. A second collar 7 is slidingly mounted on the bar and is adapted to be locked in adjusted position by a set screw 8. These-collars preferably have cylindrical surfaces con forming approximately to the inner surface of the tube and they are so spaced apart that the canting action of the arm 4 will give 'sutlicient engagement to the walls of the flue to hold the bar in place.

l Vhat I claim as new is 1. In a. drill brace, the combination of a bar; a support extending at an angle to the bar; and spaced collars fixed on the bar adapted to engage the walls of a flue, one collar being pressed into engagement with a wall of the fine at one side of the axis of the flue and the other collar pressing the wall of the flue at the opposite side of the axis through the canting action of the support.

2. In a drill brace, the combination of a bar; a support extending at an angle to the bar; and spaced collars on the bar adapted to engage the walls of a flue, one of the col lars being adjustable lengthwise of the bar and one collar being pressed into engagement with a wall of the flue at one sideof the axis of the flue and the other collar pressing the wall of the flue at the opposit side of the axis through the canting action of the support.

In testimony whereof I have hereunto set my hand.

FRED M. BETTES. 

